Yamaha VX Deluxe jetski overheating when under load. Tech Tuesday.
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- Опубліковано 26 сер 2024
- Jetski is overheating, only when under load and everything is normal otherwise. Meaning you can flush it and run idle and no overheat warning is coming on. The minute you give power and sail for a little distance approximately 700 yards, the jetski overheat and goes into limb mode.
Here is the possible failure and solution to this problem, and how to solve it.
the jetski used here is a Yamaha VX deluxe, however this could be the case on any jetski out there, which has been in salty, dirty or sandy waters. They simply ingest the salt, sand and dirt and cloggs the coolant system.
enjoy and work slowly towards to finish line. no rush is recommended .
enjoy best regards Rene
Thanks ao much, mine is having the exact same issues as yours. I bought it a few years ago from my brother, he had a similar issue and removed the head, it worked fine for a while and now it's happening to me. I think I'll try what you did first. Thanks for the very informative video!
Thank you for watching and commenting. If you are lucky this will take care of your problem. However if it is worse then it might be necessary to change the cylinder head to solve the problem. You can also back flush it to see if there is an ingestion problem from a seashell in the tubing.
I have a very recent video on cylinder head assembly with the same issue here:
ua-cam.com/video/WfFiVE-oODw/v-deo.htmlsi=p2i2TkUvg7kPZg7g
I hope this will get you on the right path to success.
Sail safely, best regards Rene.
Do you know why my speedometer reads more than it should? What can I do? I appreciate it.
Your speedometer might be in Km/H and not Miles/hr. Ist a quick change on the display - in mode settings.
However if it reads miles/H and reading too much it could be a calibration of the system that needs to be done and I don’t have a solution for this at hand.
Hope this helps, best regards Rene
Good morning sir. Can you tell me where is locate the thermosensor on vx1100. Thanks you
Hi there - and thanks for watching and commenting, the thermo sensor on your Jetski should be mounted on the side of your engine block, fastened by 2 screws. Check and download diagram below 👇
www.slideshare.net/slideshow/2005-yamaha-vx1100-cruiser-deluxe-sport-service-repair-manual/87765754
If you have problems with cooling and the temp horn and warning light comes on - be aware that most likely you have ingested foreign object like sand and shells into the engine and they are blocking your cooling system. A back flush can sometimes help you remove this debris, however if it is sand it tends to form and collect inside the cooling walls of the crank block. Time after time of use this gets heated up and down creating a pretty solid salt stone inside the engine, which in turn prohibits the water to cool the engine enough. The water can only access a part of the cylinder wall on the outside and therefore the ski runs hot. 🥵 you can sometimes be lucky to clean out you majority of the cooling channels from the exhaust manifold side and that might clear you problem for a while.
Worst case you will need a new head job done and it time consuming and expensive too. I cannot recommend to operate the jet skis near sand bottom beaches since they stir up the sand and ingests it, resulting in a lot of problems.
Here is a video of my experience with a lot of sand and a head change as a result:
ua-cam.com/video/qZGHGQ2RLf4/v-deo.htmlsi=KdMTvd9FaDb9bdya
Here is a video on exhaust manifold and cleaning before taking the engine apart :
ua-cam.com/video/u6LWCmhM0qg/v-deo.htmlsi=sGqlR5bV4FubvkvI
There are a lot of videos on how to backflush your Jetski so look for one of those too.
I really hope this helps, and my apologies for a little late reply.
Sail safely, best regards Rene
@@techtips101 thank you very much. the best help ever.
@@rafaelnakamura9935you are more than welcome 🙏 - I know it’s frustrating
Sail safely, best regards Rene
My warning light comes on after 20 minutes riding it a little hard. Could that be that is overheating also?
Thanks for watching and commenting, most likely if it is the temperature warning light and not oil, make sure to check correct oils quantity. Let it run idle for 5 mins and check oil level, if needed adjust and add oil. If that is ok, and problem persists, and if you don’t have and fail codes on the display, most likely it is a cooling problem. The Jetski if operated near shorelines or sandy sandbars, will ingest the sand and salt. Together if you are unlucky and maybe have a little residue left after flushing this creates a salt stone like substance and hardens up inside the cooling canal in the internal engine. If you are lucky, it can just be a small shell in one of the cooling hoses and you can take that away with a backflush most of the time. Search for backflush video on Jetski and there are lots of videos on the subject, I will make one in the future. I this doesn’t help you might be able to help yourself by cleaning the manifold and cylinder walls cooling canals as I have on this video. The engine is running hot very fast if it does not have access to free running cooling water. If you still have the problem it could be a little longer operation where you will have to take the engine apart and do a head job, since the salt stone most likely have settled inside the cylinder cooling canals and hardened, this needs to be removed in order to let the engine cool again at full speed. Most likely if there is a 1/4 inch salt there it will run hot after a certain time, at hard power, but will run at lower power settings without alarm. However it’s just a matter of time before it clogs up more.
Here is a video on how to do the head job and cleaning as well:
ua-cam.com/video/qZGHGQ2RLf4/v-deo.htmlsi=4G6Xnr6gv5r6spgf
Sail safely, best regards Rene
Did this solve the problem?
Thank you for watching and commenting, yes it did take care of the problem - if I couldn’t get this clogging out I would have had to remove the head and change the head gasket too and it would have been a lot more work to accomplish. The foreign object that goes in here crystallizes and that’s why it clogs up.
Hope that helps
Sail safely, best regards Rene
In the end I had to get a new Cylinder head as this was totally clogged as well, when I took it apart.
Here is the link for that video :
ua-cam.com/video/qZGHGQ2RLf4/v-deo.html
sail safely, best regards Rene